Describes a person who is mentally quick, perceptive, and intelligent. Often used for children or young people. Similar to 利口 (rikō) but with a slightly more literary or formal tone.
賢い is the most common word for 'smart' or 'wise', used in everyday speech. 怜悧 is less frequent and carries a slightly formal or elegant nuance.
Etymology
The word is composed of two kanji both meaning 'clever' or 'intelligent': 怜 (rei, 'wise') and 悧 (ri, 'clever'). It is a Sino-Japanese compound (kango) with no clear native Japanese origin. The exact historical derivation is uncertain.
